Turn of phrase (5)
I believe the answer is:
idiom
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">turn of phrase</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for idiom that I've seen before include "Phrase such as over the moon" , "Expression that's characteristic of particular group" , "Special linguistic usage" , "Peculiar term" , "Distinctive expression" .)